<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input v-model.trim="name" placeholder="在此输入姓名" type="text" />
    </div>
    <div>
      <span>年龄:</span>
      <input v-model.number="age" placeholder="在此输入年龄" type="number" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="men">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click.prevent="addBtn">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="item in arr" :key="item.id">
          <td>{{ item.id }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.men }}</td>
          <td>
            <button>删除</button>
            <button @click.prevent="edit(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      men: [],
      name: "",
      age: 0,
      arr: JSON.parse(localStorage.getItem("arr") || "[]"),
    };
  },
  watch: {
    arr: {
      deep: true,
      handler() {
        localStorage.setItem("arr", JSON.stringify(this.arr));
      },
    },
  },
  methods: {
    addBtn() {
      if (this.name == "" || this.age == 0) {
        return alert("不能为空");
      }
      let id = this.arr.length == 0 ? 1 : this.arr[this.arr.length - 1].id + 1;
      this.arr.push({
        id: id,
        name: this.name,
        age: this.age,
        men: this.men,
      });
      (this.men = []), (this.name = ""), (this.age = 0);
    },
    edit(i) {
      this.name = this.arr[i].name;
      this.age = this.arr[i].age;
      this.men = this.arr[i].men;
      
    },
  },
};
</script>
